The Coil-Current Effect in the Joule Balance with Bifilar Coil and Compensation Coils Applied

摘要

Bifilar coil can be used in the Kibble/joule balance to improve the equivalence of magnetic factor Bl in the two measurement phases. In the joule balance, compensation coils are applied to reduce the effect of external field. When the bifilar coil and compensation coils are used together in the joule balance, the coil current effect is analyzed in this paper. It is found that the magnetic factor change in the velocity phase is about 2.3 times as the value obtained in the weighing phase.